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Maintenance of marine heat exchangers is important to ensure the small pathways in both types of coolers do not become fouled. Depending on the system different types fouling may occur. In oil based systems, an insufficient amount of cooling medium or inefficient flow of oil through the heater can cause the heater to become fouled.
A Yanmar 2GM20 marine diesel engine, installed in a sailboat. The center pulley is the crankshaft, the lower left one the seawater pump, the upper right one the alternator. The Yanmar 2GM20 is a series of inboard marine diesel engines manufactured by the Japanese company Yanmar Co. Ltd. It is used in a wide range of sailboats and motorboats.
Oil cooling is the use of engine oil as a coolant, typically to remove surplus heat from an internal combustion engine. The hot engine transfers heat to the oil which then usually passes through a heat-exchanger, typically a type of radiator known as an oil cooler. The cooled oil flows back into the hot object to cool it continuously.
At the end of 2023, Wärtsilä's market share in marine medium-speed main engines was 46% and in auxiliary engines 17%. At the end of 2023 Wärtsilä's market share for gas and liquid fuel power plants was 13%. [24] Wärtsilä's biggest competitors in the marine market are MAN Energy Solutions, Caterpillar Inc. and Kongsberg Gruppen.
In two-stroke marine diesel engines for sea-going craft, the most common fuels are residue oils. [22] Günter Mau argues that no uniform standards for such fuels exist, which is why they have several different colloquial names, including Marine Intermediate Fuel, Heavy Fuel Oil, Marine Bunker Fuel, and Bunker C Fuel. [23]
The viscosity of oil can be ten times greater than water, increasing the energy required to pump oil for cooling, and reducing the net power output of the engine. Comparing air and water, air has vastly lower heat capacity per gram and per volume (4000) and less than a tenth the conductivity, but also much lower viscosity (about 200 times lower ...
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